I stopped reading at this because you summed everything up right there. There isn't a player alive right now, Trout, Acuña, Ohtani, Soto, Seager, Freeman, none of them, who are worth these $250 - 350M over the course of ten years deals just based on the risk for injury alone.
It only takes one injury to potentially detonate a player and they'll never be close to what they're being paid and now you're in the back pages of a 300 page document looking for an out because a failed leap to catch a fly ball sent you crashing into the wall (Acuña) and now you're no longer a 40/40 candidate, or a second TJ surgery (Ohtani) has you relegated to DH for half of two seasons and you're finished pitching and have to hope you're able to learn centre field like Rick Ankiel, or your production goes down because they ****ed with the ball again. There's just so much uncertainty that I wouldn't bet on any player I just referenced aside from Trout and to a lesser extent Freeman, to just keep at a pace that dictates such a large deal.